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ePaper created 2016-01-20, 13:53:08 | version 1.38.0
34 I I new product technique _ shaping canals _The mechanical and biological objectives of shaping root canals were beautifully described by Herbert Schilder in 1974.1 As relevant today, in the era of automated canal preparation techniques, as they were in the days of hand preparation tech- niques,theseobjectivesprovidetherationaleforthe designs, tapers and tip sizes of modern-day endo- dontic instruments. Shaping the root canal facili- tates 3-D irrigation and cleaning of the root canal system of all pulp tissue, bacteria and their related by-products.2 Importantly, shaping the root canal provides the resistance form and facilitates filling the root canal system.1,3 _From hand to rotary When manually shaping canals with multiple sequences of stainless-steel files and Gates–Glidden drills,rootcanalpreparationtechniques,oldandnew, have many deficiencies and iatrogenic problems, such as blocking, ledging, transportation and perfo- ration,arecommon.4 Theuseofnickel-titanium(NiTi) files in continuous rotation driven by a dedicated en- dodonticmotorcapableofspeedandtorquecontrol maintains the original pathway of the canal while limiting the amount of apically extruded debris.5,6 However, while the advantages of continuously ro- Fig. 1a_WaveOne GOLD file series, Small, Primary, Medium and Large. Fig. 1b_WaveOne GOLD files have variable and reducing tapers, producing a more conservatively shaped canal compared with their WaveOne predecessor. Fig. 2_The cross-section of WaveOne GOLD is a parallelogram with an 85-degree active cutting edge with alternate one and two point contact. (Images courtesy of Prof. Sergio Kuttler) roots1_2015 Shaping canals with confidence: WaveOne GOLD single-file reciprocating system Author_ Dr Julian Webber, UK Fig. 1a Fig. 1b Fig. 2